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B How does space expand?

  1. Apr 18, 2017 #1
    how can the universe be expanding if matter nor mass can be created?
  2. jcsd
  3. Apr 18, 2017 #3


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    Science Advisor

    Because the expansion doesn't involve creating matter. It's just existing matter getting further apart.

    That said, matter/mass can certainly be created or destroyed. Mass is a form of energy, and other forms of energy can be converted to mass under the right conditions. When heavy particles decay or matter and anti-matter meet and are annihilated, mass is also destroyed.
  4. Apr 26, 2017 #4

    Fervent Freyja

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    Gold Member

    The truth, there is no satisfying explanation. They really don't understand the mechanics behind how space expands... :cry:
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